Biotechnology: Principles and Processes — BIOLOGY STD 12 Science — Question

What are viruses parasitising bacteria called? Draw a well labelled diagram of the same.

State Mendel’s principle of segregation.

Explain, giving three reasons, why tropics show greatest lavels of species diversity.

In our society the women are often blamed for giving birth to daughters. Can you explain why this is not correct?

Explain the primary productivity of ecosystem.

A person shows strong unusual hypersensitive reactions when exposed to certain substances present in the air, identify the condition. Name the cells responsible for such reactions. What precaution should be taken to avoid such reactions.

What is semen?

Name the kind of organisms which constitute the pioneer community of xerarch and hydrarch succession, respectively.

Bacteria cannot be seen with the naked eyes, but these can be seen with the help of a microscope. If you have to carry a sample from your home to your biology laboratory to demonstrate the presence of microbes with the help of a microscope, which sample would you carry and why?

What is Graafian follicle?